During a study spanning 201 days, 267 persons were injured in snowmobile accidents. The majority of the patients were teenagers and young adults, usually male, and 75% of the injuries occurred during the weekend, either in mid afternoon or evening. Alcohol was a factor in two fifths of the accidents, and it figured prominently in the more serious injuries. Soft tissue injury, when not associated with more serious damage, was sustained by 139 patients, and ligamentous or cartilaginous tears by 55 patients. Seven patients had dislocated joints, and 55 patients fractured a total of 83 bones. Fourteen patients sustained visceral injury including brain damage, and three of these patients died.